{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU9404-1KK40","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU9404-1KK40","canonicalUrl":"https://aoctrl.com/siemens/5SU9404-1KK40","factsUrl":"https://aoctrl.com/api/mcp/products/5SU9404-1KK40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SU9 RCBO, RCD-operated circuit breaker, 40 A, C characteristic, 10 kA breaking capacity, 1P+N, 18 mm width.","salesMarkdown":"The Siemens 5SU9404-1KK40 is a SENTRON 5SU9-series RCBO — an RCD-operated circuit breaker combining overcurrent and residual current protection in a single 18 mm module. Rated 40 A with a C tripping characteristic and 10 kA breaking capacity per EN 60898 and IEC 60947-2, it protects final circuits against overload, short-circuit, and AC earth faults in a 1P+N configuration. ## Current derating and ambient limits Above that, derate linearly: 37.6 A at 40 °C, 36.4 A at 45 °C, 34.8 A at 50 °C, 32.4 A at 55 °C. For a panel running warm — say 45 °C internal ambient — the usable continuous current drops to 36.4 A, so size the upstream protection accordingly. Snaps onto DIN rail, any mounting position. 18 mm wide (1 width unit), 77 mm deep, 125 mm tall; installation depth is 70 mm. IP20 with the distribution board installed and conductors connected. Listed as current production — no obsolescence notice on record.","metaTitle":"Siemens 5SU9404-1KK40 SENTRON RCBO, 40A C-Curve, 10kA, 1P+N","metaDescription":"Siemens 5SU9404-1KK40 SENTRON RCBO, 40A rated, C characteristic, 10kA breaking capacity, 1P+N, 18mm wide. Current production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"77 mm","Solid":"0.75 ... 35 mm²","Width":"18 mm","title":"5SU9404-1KK40","Height":"125 mm","Maximum":"0.75 W","Stranded":"0.75 ... 35 mm²","at 30 Cel":"40 A","at 40 Cel":"37.6 A","at 45 Cel":"36.4 A","at 50 Cel":"34.8 A","at 55 Cel":"32.4 A","description":"RCBO, 10 kA, 1P+N, Type AC, 100 mA, C-Char, In: 40 A, Un AC: 230 V, pigtail 600 mm, solid N","Halogen-Free":"Yes","Silicon-Free":"Yes","During Storage":"-40 ... +75 °C","Number of poles":"2","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-25 ... +45 °C","Product designation":"RCD-operated circuit breaker","Protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage category":"III","Design of the product":"Instantaneous","Energy limiting class":"3","Number of width units":"1","Type of fault current":"AC","Number of poles / Note":"1P+N","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","circuit-breaker / Design":"5SU9","Current / at AC / rated value":"40 A","Tripping characteristic class":"C","acc. to EN 60898 / rated value":"10 kA","For Testing Equipment / Minimum":"125 V","Position / of power supply cord":"Either top or bottom","Number of poles / with protection":"1","acc. to IEC 60947-2 / rated value":"10 kA","Product feature / Touch protection":"Yes","Supply voltage frequency / rated value":"50 Hz","Tripping residual current / rated value":"100 mA","Influence of the surrounding temperature":"Max. 95% humidity","Surge current resistance / at (8/20) μs":"1 kA","Tightening torque / with screw-type terminals":"1.2 ... 2 N·m","Product function / neutral conductor switching":"No","Mechanical service life (switching cycles) / typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/4b12c973eb0361901b170c71ef58a716.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629418&mlfb=5SU9404-1KK40"},"ai":{"faq":[{"question":"Will 5SU9404-1KK40 drop into a panel specified around 5SU9304-1KK32?","answer":"Both are 18 mm wide SENTRON RCBOs on the same DIN-rail footprint, so mechanical fit is the same. The 5SU9404-1KK40 is a 40 A C-curve; the 5SU9304-1KK32 is a different rating/characteristic. Verify the circuit's load and fault-current requirements before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU9404-1KK40","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/5SU9404-1KK40 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}